arm64: dts: ti: k3-am69-sk: Add support for TPS6594 PMIC

arm64: dts: ti: k3-am69-sk: Add support for TPS6594 PMIC

This patch adds support for TPS6594 PMIC on wkup I2C0 bus. This device
provides regulators (bucks and LDOs), but also GPIOs, a RTC, a watchdog,
an ESM (Error Signal Monitor) which monitors the SoC error output
signal, and a PFSM (Pre-configurable Finite State Machine) which manages
the operational modes of the PMIC.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Udit Kumar <u-kumar1@ti.com>
Link: https://lore.kernel.org/r/20231208114919.3429562-6-n-francis@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>